The neighbourhood in which the Assyrian army suffered this great disaster[67] was notorious in antiquity for its power of pestilence. Making every allowance for the untutored imagination of the ancients, we must admit the Serbonian bog, between Syria and Egypt, to have been a place terrible for filth and miasma. The noxious vapours travelled far; but the plagues, with which this swamp several times desolated the world, were first engendered among the diseased and demoralised populations, whose villages festered upon its margin. A Persian army was decimated here in the middle of the fourth century before Christ. "The fatal disease which depopulated the earth in the time of Justinian and his successors first appeared in the neighbourhood of Pelusium, between the Serbonian bog and the eastern channel of the Nile."[68] To the north of the bog the Crusaders also suffered from the infection. It is, therefore, very probable that the moral terror of this notorious neighbourhood, as well as its malaria, acting upon an exhausted and disappointed army in a devastated land, was the secondary cause in the great disaster, by which the Almighty humbled the arrogance of Asshur. The swiftness, with which Sennacherib's retreat is said to have begun, has been equalled by the turning-points of other historical campaigns. Alexander the Great's decision to withdraw from India was, after victories as many as Sennacherib's, made in three days. Attila vanished out of Italy as suddenly as Sennacherib, and from a motive less evident. In the famous War of the Fosse the Meccan army broke off from their siege of Mohammed in a single stormy night. Napoleon's career went back upon itself with just as sharp a bend no less than thrice--in 1799, on Sennacherib's own ground in Syria; in 1808, in Spain; and in 1812, when he turned from Moscow upon "one memorable night of frost, in which twenty thousand horses perished, and the strength of the French army was utterly broken."[69] [67] The statement of the Egyptian legend, that it was from a point in the neighbourhood of Pelusium that Sennacherib's army commenced its retreat, is not contradicted by anything in the Jewish records, which leave the locality of the disaster very vague, but, on the contrary, receives some support from what Isaiah expresses as at least the intention of Sennacherib (chap. xxxvii. 25). [68] Gibbon, _Decline and Fall_, xliii. [69] Arnold, _Lectures on Modern History_, 177, quoted by Stanley.